Logo Search packages:      
Sourcecode: linux version File versions  Download package

sun3mmu.h

/*
 * Definitions for Sun3 custom MMU.
 */
#ifndef __SUN3_MMU_H__
#define __SUN3_MMU_H__

#include <linux/types.h>
#include <asm/movs.h>
#include <asm/sun3-head.h>

/* MMU characteristics. */
#define SUN3_SEGMAPS_PER_CONTEXT    2048
#define SUN3_PMEGS_NUM              256
#define SUN3_CONTEXTS_NUM               8

#define SUN3_PMEG_SIZE_BITS    17
#define SUN3_PMEG_SIZE         (1 << SUN3_PMEG_SIZE_BITS)
#define SUN3_PMEG_MASK         (SUN3_PMEG_SIZE - 1)

#define SUN3_PTE_SIZE_BITS       13
#define SUN3_PTE_SIZE          (1 << SUN3_PTE_SIZE_BITS)
#define SUN3_PTE_MASK          (SUN3_PTE_SIZE - 1)

#define SUN3_CONTROL_MASK       (0x0FFFFFFC)
#define SUN3_INVALID_PMEG     255
#define SUN3_INVALID_CONTEXT 255

#define AC_IDPROM     0x00000000    /* 34  ID PROM, R/O, byte, 32 bytes      */
#define AC_PAGEMAP    0x10000000    /* 3   Pagemap R/W, long                 */
#define AC_SEGMAP     0x20000000    /* 3   Segment map, byte                 */
#define AC_CONTEXT    0x30000000    /* 34c current mmu-context               */
#define AC_SENABLE    0x40000000    /* 34c system dvma/cache/reset enable reg*/
#define AC_UDVMA_ENB  0x50000000    /* 34  Not used on Sun boards, byte      */
#define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */
#define AC_SYNC_ERR   0x60000000    /*   c fault type                        */
#define AC_SYNC_VA    0x60000004    /*   c fault virtual address             */
#define AC_ASYNC_ERR  0x60000008    /*   c asynchronous fault type           */
#define AC_ASYNC_VA   0x6000000c    /*   c async fault virtual address       */
#define AC_LEDS       0x70000000    /* 34  Zero turns on LEDs, byte          */
#define AC_CACHETAGS  0x80000000    /* 34c direct access to the VAC tags     */
#define AC_CACHEDDATA 0x90000000    /* 3 c direct access to the VAC data     */
#define AC_UDVMA_MAP  0xD0000000    /* 4   Not used on Sun boards, byte      */
#define AC_VME_VECTOR 0xE0000000    /* 4   For non-Autovector VME, byte      */
#define AC_BOOT_SCC   0xF0000000    /* 34  bypass to access Zilog 8530. byte.*/

#define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
                      | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)

/* Bus access type within PTE. */
#define SUN3_PAGE_TYPE_MASK   (0x0c000000)
#define SUN3_PAGE_TYPE_MEMORY (0x00000000)
#define SUN3_PAGE_TYPE_IO     (0x04000000)
#define SUN3_PAGE_TYPE_VME16  (0x08000000)
#define SUN3_PAGE_TYPE_VME32  (0x0c000000)

/* Mask for page number within PTE. */
#define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)

/* Bits within bus-error register. */
#define SUN3_BUSERR_WATCHDOG  (0x01)
#define SUN3_BUSERR_unused    (0x02)
#define SUN3_BUSERR_FPAENERR  (0x04)
#define SUN3_BUSERR_FPABERR   (0x08)
#define SUN3_BUSERR_VMEBERR   (0x10)
#define SUN3_BUSERR_TIMEOUT   (0x20)
#define SUN3_BUSERR_PROTERR   (0x40)
#define SUN3_BUSERR_INVALID   (0x80)

#ifndef __ASSEMBLY__

/* Read bus error status register (implicitly clearing it). */
static inline unsigned char sun3_get_buserr(void)
{
      unsigned char sfc, c;

      GET_SFC (sfc);
      SET_SFC (FC_CONTROL);
      GET_CONTROL_BYTE (AC_BUS_ERROR, c);
      SET_SFC (sfc);

      return c;
}

/* Read segmap from hardware MMU. */
static inline unsigned long sun3_get_segmap(unsigned long addr)
{
        register unsigned long entry;
        unsigned char c, sfc;

        GET_SFC (sfc);
        SET_SFC (FC_CONTROL);
        GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
        SET_SFC (sfc);
        entry = c;

        return entry;
}

/* Write segmap to hardware MMU. */
static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
{
        unsigned char sfc;

        GET_DFC (sfc);
        SET_DFC (FC_CONTROL);
        SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
      SET_DFC (sfc);

        return;
}

/* Read PTE from hardware MMU. */
static inline unsigned long sun3_get_pte(unsigned long addr)
{
        register unsigned long entry;
        unsigned char sfc;

        GET_SFC (sfc);
        SET_SFC (FC_CONTROL);
        GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
        SET_SFC (sfc);

        return entry;
}

/* Write PTE to hardware MMU. */
static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
{
        unsigned char sfc;

        GET_DFC (sfc);
        SET_DFC (FC_CONTROL);
        SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
      SET_DFC (sfc);

        return;
}

/* get current context */
static inline unsigned char sun3_get_context(void)
{
      unsigned char sfc, c;

      GET_SFC(sfc);
      SET_SFC(FC_CONTROL);
      GET_CONTROL_BYTE(AC_CONTEXT, c);
      SET_SFC(sfc);

      return c;
}

/* set alternate context */
static inline void sun3_put_context(unsigned char c)
{
      unsigned char dfc;
      GET_DFC(dfc);
      SET_DFC(FC_CONTROL);
      SET_CONTROL_BYTE(AC_CONTEXT, c);
      SET_DFC(dfc);

      return;
}

extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
                    unsigned long type);

extern int sun3_map_test(unsigned long addr, char *val);

#endif      /* !__ASSEMBLY__ */

#endif      /* !__SUN3_MMU_H__ */

Generated by  Doxygen 1.6.0   Back to index